Underwater Wi-Fi Extension Cable Explained

  • Read Time: 3 mins

How tethered systems enable live underwater viewing

Anyone who has tried to connect a GoPro or DJI action camera to the Quik or Mimo app underwater knows the frustration. Wi-Fi does not travel through water, so the connection drops as soon as the camera goes below the surface.

Water absorbs high-frequency wireless signals, including the 2.4GHz and 5GHz bands used by Wi-Fi and Bluetooth. As a result, live preview and camera control are lost almost immediately. This limitation is explained in more detail in our guide on why Wi-Fi and Bluetooth don’t work underwater.

The term “underwater Wi-Fi extension cable” is commonly used to describe systems that allow live underwater viewing. In practice, these systems do not extend Wi-Fi through water. Instead, they use a physical tether to carry the camera’s signal to the surface.

For a broader explanation of how live underwater video systems work, see our main guide on live underwater video feeds.

The Seavu Seeker Marine Kit: a tethered live-view system

The Seavu Seeker Marine Kit is designed to enable live underwater viewing by carrying the camera’s wireless signal to the surface. Rather than attempting to transmit Wi-Fi through water, the system maintains the connection above water where wireless communication works reliably.

Seavu Seeker with action camera and phone showing live underwater fishing footage

How it works

  1. The GoPro or DJI action camera is placed inside a sealed underwater housing.
  2. A receiver at the camera end captures the camera’s Wi-Fi and Bluetooth signals.
  3. A custom low-loss marine-grade tether carries the signal to the surface.
  4. A surface receiver and transmitter rebroadcast the signal wirelessly.
  5. The live feed is viewed and controlled using the standard GoPro Quik or DJI Mimo app.

This approach provides real-time live view, camera control, and recording, even when the camera is many metres underwater.

Why a tethered system works underwater

Wireless signals cannot travel through water, but electrical and optical signals can be carried through physical cables. The Seeker system uses a tether to transport the camera’s signal to the surface, where normal wireless communication resumes.

This makes tethered live-view systems suitable for fishing, exploration, training, and research applications where real-time feedback is important.

Advantages over so-called underwater Wi-Fi cables

  • Purpose-built marine tether designed for long-distance signal integrity
  • Flexible, corrosion-resistant construction for saltwater use
  • No direct wired connection to the camera or phone, reducing corrosion risk
  • Compatible with current action cameras such as GoPro HERO13 and DJI Action 5 Pro
  • Designed with a clear upgrade path for future camera models

Live underwater viewing with GoPro Quik or DJI Mimo

Using the Seeker Marine Kit, users can:

  • View live underwater footage in real time
  • Adjust camera settings and switch modes
  • Start and stop recording remotely
  • Monitor footage on a phone or tablet using the native camera app

If you are looking for step-by-step setup guidance, see our guide on how to stream live underwater footage.

Trusted for real-world underwater use

The Seeker Marine Kit is used by researchers, filmmakers, educators, and recreational users worldwide. It is designed and tested in Australia and proven in saltwater environments.

Many marine research organisations use similar tethered underwater monitoring approaches to observe and document underwater environments in real time.

Getting started with the Seeker Marine Kit

If you are searching for a reliable way to maintain a live connection between your underwater camera and mobile device, a tethered live-view system is the practical solution.

Learn more about the Seavu Seeker Marine Kit or explore other underwater camera systems designed for live viewing.

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1. Definitions and Interpretation

1.1 Definitions

In this Agreement the following definitions apply:

  1. Ambassador means the key person set out in item 1 of SCHEDULE 1
  2. Ambassador’s Commission means the commission to be paid to the Ambassador by the Company for Ambassador referred sales as set out in SCHEDULE 4.
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  5. Endorsement Services means the promotional and endorsement services provided by the Ambassador that are referred to in clause 3(a) and set out in SCHEDULE 2;
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  9. Term means the period of time described in clause 2 and item 3 of SCHEDULE 1;
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1.2 Interpretation

In this Agreement:

  1. a reference in this Agreement to a statute or a section of a statute includes all amendments to that statute or section passed in substitution for the statute or section referred to and incorporating any of its provisions;
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2. Commencement and Term

This Agreement commences on the Commencement Date and continues subject to any rights of early termination under clause 8 for a period of time set out in item 3 of SCHEDULE 1.

3. Endorsement and Promotion of Products

  1. The Ambassador agrees to:
    1. provide the non-exclusive Endorsement Services to the Company in the Territory for the period of time set out in item 3 of SCHEDULE 1 starting on the Commencement Date set out in item 1 of SCHEDULE 1;
    2. use reasonable endeavours to promote the Products in a matter consistent with the authorised use of the Products on the Ambassador’s social media accounts and website;
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4. Intellectual Property

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  2. The Ambassador grants to the Company a non-exclusive licence to use the Promotional Materials on the Company’s social media accounts, websites and other promotional materials and this clause shall endure beyond the termination of this agreement.

5. Warranties

The Ambassador warrants during the Term of this Agreement that:

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  2. no similar licence has been granted to any other party in order to promote or endorse any product or service that competes with Products;
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  4. the Ambassador will not advocate illegal activity or be obscene, defamatory or otherwise violate the rights of any nature whatsoever of any person;
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  6. it is responsible for all costs and expenses in relation to this Agreement, including the provision of the Endorsement Services; and.
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6. Ambassador's obligations

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    3. the Ambassador can prove that it knew the information before the information was disclosed to it by the Company.

7. Company’s Obligation

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    4. shall provide support to the Ambassador to enable the Ambassador to understand and use the functionality of the Products;
    5. has the discretion to provide the Ambassador with new Products developed by the Company;
    6. will enable the Discount Codes to provide a discount to the Ambassador’s referred clients who purchase the Product’s on the Company’s website;
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8. Termination

  1. This Agreement may be terminated by the Company in any of the following circumstances:
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      2. the Company enters into, or resolves to, enter into, a scheme  or arrangement, compromise or composition with any class of creditors;
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      4. anything having a substantially similar effect to any of the events specified above happens under the law of any applicable jurisdiction.
    3. On the expiry or early termination of this Agreement, Ambassador will cease to provide the Endorsement Services.

9. Indemnity

  1. The Ambassador agrees to hold the Company, its officers, agents, assignees and employees harmless from any liability from any injury, damage or claim suffered by the Ambassador arising from or relating to this Agreement and the Ambassador’s provision of the Endorsed Services.  

10. Dispute Resolution

  1. If a dispute arises in connection with this Agreement, a party may give the other party a notice specifying the dispute.
  2. Within 5 business days after the notice is given, each party may nominate in writing a representative to settle the dispute on its behalf.
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12. Limitation on assignment

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13. Further agreements

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14. General provisions

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    This Agreement is subject to the laws of the State of Victoria with the Courts of the State of Victoria having exclusive jurisdiction over any disputes arising in respect of this Agreement.

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